Diamond-cutting tool.



Hi g

E. MAHY.

No. 709,229. Patented Sept. l5, I902;

mAmoun CUTTING TOOL.

[Applicajzion filed. Apt. 26, 1902.) (No Model.)

iffomz ey UNITED I STATES PATENT OFFICE.

EUGENE MAHY, or

CINCINNATI, OIIIO.

DIAMOND-CUTTING TOOL.

SPECIFICATION forming part of Letters Patent 110,709,229, dated September 16, 1902.

,dop which may be so adjusted as to bring the diamond into the proper relative positions to the wheel for cutting the table and facets thereon andat the same time to preserve that, firmness 'or solidity which is necessary in ma chinery of this character and also to provide a convenient means of inserting and removing the stone-holder from the dop. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is'a view of the dop so adjusted asto cut the top surface or table of the diamond. Fig. 2 is a view of the dop adjusted at the an-.

gle for cutting the facets'nand Fig. 3 is a vertical-sectional view of the dop adjusted as in Fig. 1. Figs. 4t and 5 illustrate the clamp E and its shan'k E as shown in the first three 'figures, Fig. 4 being a horizontal. top view thereof and Fig. 5 being a vertical view of the same. i

The body of the dop A is of solid brass or of other suitable material, the upper portion thereof being cylindrical ih shape, tapering below, the lower surface or plane being at an oblique angle to the axis thereof,and is provided .with the stone-holder D, into which the gem to be cut is placed at its opening D The stone-holder D is screwed into the body of the'dop A and at right angles to the lower surface thereof. The clamp E is a two-tined fork or prong, the shank E of which when in place is inserted into an opening in the body of the dop at right angles to the lower surface thereof and when so inserted may be made fast by the set-screw A the prong E holding and supporting the stone in the opening D rigidly. The upper portion of the body A of the dop is hollowed out so as to form a cylindrical socket, in the center of which, parallel to the axis thereof, is fixed Serial No. 104.757. or model.)

the pivot B. The disk B is drilled through the center with a hole the diameter of the pivot B and fits into said socket, the pivot B being the hearing thereof. The until serves to make the disk 15 fast in its place.

The rim of the said socket at the point L op posite to the diamond-holder D and the point F opposite to the center of the shank E" is cut. down at right angles, making an. oil.- set at said points equal to the thickness of the pin 13*, so that the rim of the socket upon that half of the circumference in the background and not shown in the drawings is higher than that portion thereof showrl in the foreground. The pin B projects from the disk B at a point opposite that at which the stem 0 is fastened. The stem 0 is fastened to the disk, so that when the pin 13* is at the point F the said stem 0 is parallel to the threaded portion of the diamond-holder D and at right angles to the lower surface of the body of the dop A, and whenthe pin 15 is at the point F the stem (3 is at about the standard angle of thirty-six degrees to the lower surface of the dop.

The method of operation of this tool is as follows: The diamond being placed in the holder D and made fast by the clamp E, the stem 0 of the tool being held by the arm of the ordinary diamond-cutting machine, the

.pin B being at the point F, the stone is brought into the direct contact with the horizontally-revolving wheel ordinarily used for diamond-cutting. After cutting the table or culet the nut B" maybe loosened and the disk B revolved until the pin 13 isin contact with the offset in the rim at the-point F, thus alteripg the relative position of the stone to the wheel and giving the angle (about thirty six degrees) necessary for cutting the facets. The diamond-holder D being screwed into said dop gives it greater securityand adjustability.

W'hat I claim as my invention, and desire to secure by Letters Patent, is-

1. A diamond-cutte1"s dophaving a Cll'C-lb lar recess or socket in the upper portion thereof, a rotatory disk within said socket carryingat a point other thanits center the stem of said dop, substantially assetforth.

2. A diamond-euttefs dop having a circular recess orsockot in the upper portion there of, a rotatory disk within said socket carrying at a point other than its center the stem of said dop and means for securing saiddisk in place, substantially as set forth.

3. In a diamond-cutters dopthe combination of a socket in the upper portion thereof,

a pivot fixed in the center of said socket parallel to the axis thereof, a disk or wheel revolving thereon carrying the stem of said 4. In a diamond-outters dop the combination of a socket in the upper portion'thereof,

a pivot fixed in the center of said socket parallel to the axis thereof, a disk or wheel revolving thereon carrying the stem of said dop,

iotfsets diametrically opposite in the rim of said socketand a pin protruding from the circumference of said disk, and a diamondholder fixed to said dop by being screwed therein, substantially as set forth.

EUGEJSE MAHY,

In presence of- JOHN WELD PEQK, WM. H. SCHMIDT. 

